/**
    Copyright (C) 2011  Alexander Vollmer

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jefb.web.util;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;

public abstract class WebUtil {
	public static String convertByteLength(Long length) {
		if (length > 1024) {
			if(length / 1024 / 1024 > 1024){
				return String.valueOf(length / 1024 / 1024 / 1024) + "GB";
			} else if (length / 1024 > 1024) {
				return String.valueOf(length / 1024 / 1024) + "MB";
			} else {
				return String.valueOf(length / 1024) + "KB";
			}
		} else {
			return length.toString() + "B";
		}
	}

	public static String currentSessionUser() {
		SecurityContext securityContext = SecurityContextHolder.getContext();
		Authentication authentication = securityContext.getAuthentication();
		if (authentication != null) {
			return authentication.getPrincipal() != null ? authentication
					.getPrincipal().toString() : null;
		}
		return null;
	}

}
